SupportedTextSelection Enumeration
Contains values that specify whether a text provider supports selection and, if so, whether it supports a single, continuous selection or multiple, disjoint selections.
This enumeration has a FlagsAttribute attribute that allows a bitwise combination of its member values.
Namespace: System.Windows.Automation
Assembly: System.Windows (in System.Windows.dll)
For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.